Displaying 20 results from an estimated 1000 matches similar to: "Problem with S4 slots in C code (PR#4073)"
2003 Oct 27
3
(PR#4806)
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2003 Jun 23
3
FW: S4 classes, creating in C
I am using C code to create an S4 object based on Douglas Bates's example
in his lecture notes on
<http://www.ci.tuwien.ac.at/Conferences/DSC-2003/Tutorials/RExtensions/slide
s.pdf>
http://www.ci.tuwien.ac.at/Conferences/DSC-2003/Tutorials/RExtensions/slides
.pdf
e.g.
SEXP La_DGE_dc(SEXP A)
{
SEXP aa = PROTECT(duplicate(A));
SEXP adims, pivot, val;
int
2002 Nov 13
1
DLLs adding in C++ code
I would like to utilise the power of R by adding my own software as a
package written in C++. As a first step I am trying
to write a DLL with a simple function that can be called from R. The DLL
contains a C++ routine written and complied in Microsoft Visual C++ Ver 6.0
and is based upon the example in R-Exts
eg I am trying to create the following example function
SEXP out(SEXP x, SEXP y)
{
2008 May 28
1
Cross-compilers for 2.7.0
Hello,
Am I right in thinking the cross-compilations tools, kindly maintained
by Prof Ripley, are still waiting to be updated for 2.7.0?
Thanks,
Iago
--
Iago Mosqueira
Cefas
Systems Modelling
Pakefield Rd.
Lowestoft NR33 0HT
U.K.
+44 (0)1502 558003
2008 May 20
1
S4 generic for lowess
Hi,
A lowess method is defined in our package for one of our S4 classes. To
explicitely define the generic this is being used
if (!isGeneric("lowess"))
setGeneric("lowess", useAsDefault = lowess)
This works fine for many other methods inherited from various R
packages. In this case a warning is issued in R CMD check:
* checking R code for possible problems ... NOTE
2013 Jun 27
3
Read a text file into R with .Call()
Hi,
I want to read a text file into R with .Call().
So I define some NEW_CHARACTER() to store the chracters read and use SET_STRING_ELT to fill the elements.
e.g.
PROTECT(qNames = NEW_CHARACTER(10000));
char *foo; // This foo holds the string I want.
while(foo = readLine(FN)){
SET_STRING_ELT(qNames, i, mkChar(foo)));
}
In this way, I can get the desired character from qNames. The only problem
2006 Nov 17
1
Manipulating R lists in C
Hi,
I have been studying the R manual on lists but cannot seem to create a
simple R list in C - I keep on getting "'dimnames' applied to non-array"
whenever I attempt to assign names to the list elements:
Wanted output a list structure something like
[ type="Bid", price=2.0, volume=1000 ]
I can get up to a list of
[ "Bid2, 2.0, 1000 ]
But for the life of
2004 Mar 17
1
best methods for strings and structures?
I'm trying to generate an R interface for a library that's commonly used and
I'm currently writing wrapper functions for file i/o and return an object
(list?) that contains the elements of the C structure. For example, reading
a file that contains:
struct CONFIG_RECORD
{
char coeffs_filename[256];
char species_filename[256];
unsigned long
2014 Mar 06
1
Create dataframe in C from table and return to R
Hi ,
I am trying to create a dataframe in C and sebd it back to R. Can anyone
point me to the part of the source code where it is doing , let me explain
the problem I am having .
--------------------------------------------------------------------
My simple implementation is like this
SEXP formDF() {
SEXP dfm ,df , dfint , dfStr,lsnm;
char *ab[3] =
2007 Apr 19
2
setClass inside a function
Hello,
I would like to create a function that gets passed a class name and then calls setClass, and a few other functions, inside. I have done this in the past with setmethod, creating accessors for all slots in a set of S4 classes. But setClass is choking when my function is called isnide a package, telling about an error in exists(cname, where). I assume this to be a problem with the
2014 Jun 24
2
using C code to create data frame but always return as list
there is my code, expect return value is a data frame but R say it is list:
SEXP Julia_R_MD_NA_DataFrame(jl_value_t* Var)
{
SEXP ans,names,rownames;
char evalcmd[4096];
int i;
const char* dfname="DataFrameName0tmp";
jl_set_global(jl_main_module, jl_symbol(dfname), (jl_value_t*)Var);
//Get Frame cols
sprintf(evalcmd,"size(%s,2)",dfname);
jl_value_t*
2004 Jun 14
5
mkChar can be interrupted
Hi,
As was discussed earlier in another thread and as documented in R-exts
.Call() should not be interruptible by Ctrl-C. However the following
code, which spends most of its time inside mkChar, turned out to be
interruptible on RH-7.3 R-1.8.1 gcc-2.96:
#include <Rinternals.h>
#include <R.h>
SEXP foo0(const SEXP nSexp) {
int i, n;
SEXP resSexp;
if (!isInteger(nSexp))
2005 Aug 24
1
histogram method for S4 class.
Hi,
I'm trying to develop an histogram method for a class called "FLQuant"
which is used by the package FLCore (http://flr-project.org). FLQuant is
an extension to "array". There is an as.data.frame method that coerces
flquant into a data.frame suitable for lattice plotting. The problem is
that when I coerce the object and plot it after it works but if the
method is
2005 Aug 24
1
histogram method for S4 class.
Hi,
I'm trying to develop an histogram method for a class called "FLQuant"
which is used by the package FLCore (http://flr-project.org). FLQuant is
an extension to "array". There is an as.data.frame method that coerces
flquant into a data.frame suitable for lattice plotting. The problem is
that when I coerce the object and plot it after it works but if the
method is
2014 Jun 26
1
using 2D array of SEXP for creating dataframe
Hi ,
For our production package i need to create a dataframein C . So I wrote
the following code
SEXP dfm ,head,df , dfint , dfStr,lsnm;
*SEXP valueVector[2];*
char *ab[3] = {"aa","vv","gy"};
int sn[3] ={99,89,12};
char *listnames[2] = {"int","string"};
int i,j;
//=============================
PROTECT(df = allocVector(VECSXP,2));
2019 Aug 02
4
Infrequent but steady NULL-pointer caused segfault in as.POSIXlt.POSIXct (R 3.4.4)
The R script I run daily for hours looks like this:
while (!finish) {
Sys.sleep(0.1)
time = as.integer(format(Sys.time(), "%H%M")) # always crash here
if (new.data.timestamp() <= time)
next
# ... do some jobs for about 2 minutes ...
gc()
}
Basically it waits for new data, which comes in every 10 minutes, and
do some jobs, then gc(), then loop again. It
2019 Aug 04
1
Infrequent but steady NULL-pointer caused segfault in as.POSIXlt.POSIXct (R 3.4.4)
A reply from stackoverflow suggests I might have hit this bug:
https://sourceware.org/bugzilla/show_bug.cgi?id=14023
I can confirm that this glibc bug affects my system (latest CentOS 7).
However, as far as I know, R is not multithreaded in its core. Is it
possible that some library triggered this?
Regards,
Steve
Tomas Kalibera <tomas.kalibera at gmail.com> ?2019?8?2??? ??4:59???
>
2009 Mar 30
1
Setting the names attribute of a list?
Hello,
I have created a vector with 2 elements(see code below)
I am calling this function many thousands of times (hundreds of
thousands) after some time
i get
*** caught segfault ***
address 0x5, cause 'memory not mapped'
However, if i dont set the R_NamesSymbol, I do not get any such error.
Am I doing this correctly?
Thank you
Saptarshi
==CODE===
// kxp and usar are two SEXP's
2008 Oct 28
2
A question about the API mkchar()
Hi guys,
I've got a question about the API mkchar(). I have met some difficulty
in parsing utf-8 string to mkchar() in R-2.7.0.
I was intending to parse an utf-8 string str_jan (some Japanese
characters such as?, whose utf-8 code is E381B5) to R API SEXP
mkChar(const char *name) , we only need to create the SEXP using the
string that we parsed.
Unfortunately, I found when parsing the
2016 Oct 24
3
typo or stale info in qr man
man for `qr` says that the function uses LINPACK's DQRDC, while it in
fact uses DQRDC2.
```
The QR decomposition of the matrix as computed by LINPACK or LAPACK.
The components in the returned value correspond directly to the values
returned by DQRDC/DGEQP3/ZGEQP3
```